<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8"/>
    <title>1-3 外部样式</title>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<h1>这是一个外部样式表的标题</h1>
</body>
</html>
